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Abstract
Moderate rotation and moderate horizontal confinement similarly enhance the heat transport in Rayleigh–Bénard convection (RBC). Here, we systematically investigate how these two types of flow stabilization together affect the heat transport. We conduct direct numerical simulations of confined-rotating RBC in a cylindrical set-up at Prandtl number Pr=4.38, and various Rayleigh numbers 2×108⩽Ra⩽7×109. Within the parameter space of rotation (given as inverse Rossby number 0⩽Ro−1⩽40) and confinement (given as height-to-diameter aspect ratio 2⩽Γ−1⩽32), we observe three heat transport maxima. At lower Ra, the combination of rotation and confinement can achieve larger heat transport than either rotation or confinement individually, whereas at higher Ra, confinement alone is most effective in enhancing the heat transport. Further, we identify two effects enhancing the heat transport: (i) the ratio of kinetic and thermal boundary layer thicknesses controlling the efficiency of Ekman pumping, and (ii) the formation of a stable domain-spanning flow for an efficient vertical transport of the heat through the bulk. Their interfering efficiencies generate the multiple heat transport maxima.
Original language | English |
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Article number | A1 |
Pages (from-to) | 1-27 |
Number of pages | 27 |
Journal | Journal of fluid mechanics |
Volume | 939 |
Issue number | A1 |
Early online date | 24 Mar 2022 |
DOIs | |
Publication status | Published - 25 May 2022 |
Keywords
- direct numerical simulations
- turbulence
- fluid mechanics
- fluid dynamics
- high performance computing
- heat transfer
- rotation
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- 1 Oral presentation
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Multiple heat transport maxima in confined-rotating Rayleigh-Bénard convection
Hartmann, R. (Speaker), Verzicco, R. (Contributor), Lohse, D. (Contributor) & Stevens, R. J. A. M. (Contributor)
14 Sept 2022Activity: Talk or presentation › Oral presentation
Datasets
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Data support for "Multiple heat transport maxima in confined-rotating Rayleigh-Bénard convection"
Hartmann, R. (Creator), 4TU.Centre for Research Data, 2022
DOI: 10.4121/16974109, https://data.4tu.nl/articles/_/16974109 and one more link, https://data.4tu.nl/articles/_/16974109/1 (show fewer)
Dataset